Findings from a large case-control study in the US has found that women under the age of 50 who consumed modest amounts of tea had a 37% reduced risk of breast cancer (BC) compared to non-tea drinking women.

Kumar, N., Titus-Ernstoff, L., Newcomb, P. A., Trentham-Dietz, A., Anic, G. and Egan, K. M. (2009). Tea consumption and risk of breast cancer. Cancer Epidemiol. Biomarkers Prev. 18(1): 341-45.